# Polyploidy arises due to change in the

 [ A ]    number of chromatids [ B ]    structure of genes [ C ]    structure of chromosomes [ D ]    number of chromosomes
 Answer : Option D Explanation : number of chromosomes.An organism having more than two sets of homologous chromosomes is known as polyploid & the phenomenon polyploidy. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.Polyploidy refers to a numerical change in a whole set of chromosomes.